Practical techniques of processing and analyzing speckled fringe pattern in digital speckle interferometry

Fang Chen; Christopher T. Griffen; Y.Y. Hung

doi:10.1117/12.211886

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14 June 1995 Practical techniques of processing and analyzing speckled fringe pattern in digital speckle interferometry

Fang Chen, Christopher T. Griffen, Y.Y. Hung

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Proceedings Volume 2544, Interferometry VII: Techniques and Analysis; (1995) https://doi.org/10.1117/12.211886
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

This paper presents several practical techniques for processing and analyzing speckled fringe patterns. Speckle averaging by known phase shifts or random phase changes is used to acquire quality fringe patterns. Speckle location rearranging is employed to tolerate rigid body motion and speckle rearranging in phase gives enhanced speckle fringe patterns. A simple recursive filter is designed to further suppress speckle noise and an iteration algorithm applied to reconstruct quality fringe patterns. A digital Fourier transformation is utilized to process and analyze carrier like fringe patterns. A computer generated carrier combined with a reconstruction technique is developed to eliminate speckle noise. Combined use of the techniques optimize the results. The techniques and applications are described.

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Fang Chen, Christopher T. Griffen, and Y.Y. Hung "Practical techniques of processing and analyzing speckled fringe pattern in digital speckle interferometry", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); https://doi.org/10.1117/12.211886

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